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Auditore Auditore
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6 years ago
The extra 21st chromosome that causes Down syndrome is
A) usually provided by the egg.
B) usually provided by the sperm.
C) provided by the egg about half the time and by the sperm about half the time.
D) usually created sometime during prenatal development.
Textbook 
Children: A Chronological Approach, Canadian Edition

Children: A Chronological Approach, Canadian Edition


Edition: 5th
Authors:
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JLHCJLHC
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6 years ago
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Auditore Author
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6 years ago
Thanks
bkrandy
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Yesterday
This helped my grade so much Perfect
SlimyPencil
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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